{"id":"W2114074426","doi":"10.1088/0264-9381/23/9/018","title":"On spacetimes with constant scalar invariants","year":2006,"lang":"en","type":"article","venue":"Classical and Quantum Gravity","topic":"Noncommutative and Quantum Gravity Theories","field":"Physics and Astronomy","cited_by":114,"is_retracted":false,"has_abstract":true,"ca_institutions":"Dalhousie University","funders":"Natural Sciences and Engineering Research Council of Canada; Killam Trusts","keywords":"Spacetime; Covariant transformation; Homogeneous; Scalar (mathematics); Zero (linguistics); Constant (computer programming); Class (philosophy); Cosmological constant; Space time","routes":{"ca_aff":true,"ca_fund":true,"ca_venue":false,"about_ca":false,"invisible_to_affiliation_only":false},"retraction":null,"screen":null,"direct_labels":[],"prediction":{"model_version":"codex-gemma-dda1882f352a","candidate_categories":[],"consensus_categories":[],"category_scores_codex":[0.0001520466,0.0002556338,0.0003371243,0.00004822506,0.0003040607,0.00009207139,0.0001038781,0.00005131544,0.0001384211],"category_scores_gemma":[0.000007766561,0.0001736252,0.00007185826,0.0001542979,0.0006801746,0.0001127521,0.00005516072,0.0002797505,0.00005933566],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.00001232163,"about_ca_system_score_gemma":0.00004473637,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.0002795021,"about_ca_topic_score_gemma":0.00003114347,"domain_scores_codex":[0.9988163,0.0001156145,0.0001894623,0.0003427036,0.000196448,0.0003394923],"domain_scores_gemma":[0.9992254,0.0002723626,0.00008869642,0.00022536,0.00005209491,0.0001360196],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"theoretical_or_conceptual","study_design_gemma":"theoretical_or_conceptual","study_design_scores_codex":[0.0001538306,0.0003267554,0.03818688,0.000008973167,0.00003125039,0.00001302059,0.00004324385,0.000003305706,0.0005637055,0.9574655,0.001613327,0.001590164],"study_design_scores_gemma":[0.001152538,0.000487863,0.03138527,0.00007001727,0.00003674399,0.000005081652,0.0002435356,0.0003514772,0.002504932,0.9589953,0.004394922,0.0003722759],"study_design_candidate":"theoretical_or_conceptual","study_design_consensus":"theoretical_or_conceptual","genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.9715752,0.00004606548,0.004978683,0.001057143,0.00007299904,0.0001618849,0.0001137394,0.00004799887,0.02194631],"genre_scores_gemma":[0.9987348,0.000001514486,0.000193353,0.00009882285,0.0001625905,0.00001455951,0.0000456592,0.00001832276,0.0007303616],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.02715964,"threshold_uncertainty_score":0.7080231,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.006577334783106757,"score_gpt":0.2236998392440971,"score_spread":0.2171225044609903,"validation_status":"score_only:v0-immature-baseline","note":"Baseline scores from an immature model (maturity gate not passed). Scores rank; they never assert a category."}}